I would like to deploy Zimbra using base OS packages for all the 3rd party software (like MySQL, Postfix, OpenLDAP etc.) rather than Zimbra-bundled packages. Part of the reason is that we run those on all other machines so we're comfortable with configuration and maintenance there, but when it comes to Zimbra we're not exactly sure what to expect from "modified" versions of those. Does Zimbra (yahoo) really patch software itself or is it just a case of tweaked configs and underlying software is the same as the upstream version ?
In practice here's what I'm after: I'd like to use Postfix, OpenLDAP and MySQL packages from RedHat (it's our platform of choice). I would also like to consolidate ClamAV services we have (we already run ClamAV on other non-Zimbra machines).
If the above is an FAQ I would really appreciate some pointers, as I was unable to find anything of substance except for old Wiki entries that suggest that the only thing patched in 4.5 is sleepycat - everything else looks to be vanila copies of upstream.